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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54dc8f6fddc35f80fc243a61a72ba01287bb54f477bccb988d392a6e749ee2ed' 
  AND token = '2IH6FyMOT4fq5DIAZU9HrlpdHXK7GGM+/exelWDNQYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}